Grinding mill



Jan. 6, 1925.

H. F. LEINFELDT GRTNDING MILL Filed April 12 Patented Jan. 6, 1925.

HENRY LEINFELDnoF NEWARK, NEW JERsEYf GRINDING MILI.. i g I Application filed' April 12, 1922; 'Serial No 551367'.

To all whom it may co n cem Be it known that I, HENRY F. KLEIN- FELDT, a citizen of the United States, and a resident of Newark, county of Essex, and State of New Jersey, have invented certain new and useful Improvements in Grinding Mills, of which the 'following is a specification. 4

This invention relates to improvements in grinding mills. a

The principal objects of this invention are to produce a grinding mill for wet or semi-liquid products from which the contents may be removed through a `clrain aperture without the removal of the grinding elements, such as pebbles or balls, within the same and without the formation on the inner surface 'of pockets indentations or crevices, or otherwise detra cting from the surface flushness of the drum lining, 'so that an efficient grinding to an equal de: gree of an entire charge of paint or like products may be effected by the grinding elements, and the congregation 'or the aggregation of raw material within such pockets which remains ungro-und until the 'lischarge of the load is avoided; to provide a drain opening (preferably at one end and near the periphery of a cylindrical drum) which is partially closed by a strainer set in flush with the surface of the lining and having an aperture or apertures adapted to permit a strainng of the wet, liquid or semi-liquid contents, while retaining the grinding elements within the drum, and a plug seated withinsaid strainer and having projections on its inner edge adapted to register closely with the apertures in the strainer and to extend through the same a sufficient distance to form with the inner surface of the strainer and the lining of the wall an interior surface which will be fiush and without pockets, crevices or other indentations in which material may lodge and remain unground.

lVith these and other objects in View, the invention comprises the combination of members and arrangement of parts so combined as to co-act and coop'erate with each other in the performance of the functions and the accomplishment of the results herein` contemplated, and conprises in one of its adaptations the species or preferred form illustrated in the accompanying drawings, in wl1ichr r r i 1 l; isa side elevation partly in section of a" pebble mill emhodying my invention; a Fig. 2 is a frag nentary View showing that portion of one end of the pebble mill illustrated in Fig. 1,which is provided with a drain aperture;

" Fg. 3 is a section on the line 3-3 of Fig. 1; I i 4 Fig. 4-' is asection on the line t-t of Fig. 2 looking in the direction of the arrow;

Fig. 5 is a section' o-n the line 5-5 of Fig. 2.; and i V Fig. 6 is a top fragmentary View of the plug viewed from the inner endi Beferring now to these 'dicates the drum' of a grinding mill which is, as shown, cylndrical in conformation and and is' supported by sha-fts 2' suitably con'- nected to the' oppositeends or heads of the cylnder and supported on standards 3; The said cylinder is provided with a lining 4 composed of blocks ofporce'lain or other suitable material and contains the usual grinding elements, such as balls o" pebbles 5. a i f In grinding-paint and like products in a mill' of this character it is necessary, in order eiiiciently to grind the same in the mill, to have the inner surfaces of each of the circumferential and end 'walls of the cylinder lining substantially flush and free froni `pockets," crevices or indentations in which 'small 'portions' of the material may lodge and remain unground, so` that allthe paint or similar product which' isbeing ground in one operation will be operated on with an equal degree of grinding or manipulation by the grinding elements, and for this reason it was heretofore considered desrable to avoid all drain openings in such cylinders.

By the use of my nvention, I am enabled to provide means which will be effective to permit a draining of the ground products, a straining thereo f which will prevent the exit from the cylinder of grinding elements and at the same time maintain an inner surface which will be flushwith the lining 4. Such means comp rises the provision, prefe'rably in one of the end walls or heads of the cylinder and close to the drawings, l inperiphery thereof. of a drain o-pening 6 of any suitable size, in which is seated a strainer or grat-ing 7 set into the said opening so ,that its ,imer surface 7 a will be fiush with the inne-r surface i of the l z lig and this gratng or straner, as shown, comprises a cylndrioal cup-shaped portion 7 having a depressed plug seat *i and fianges 7 abutting against the outer end or head plates of the mll cylinder. S aid cupshaped portion 7 b extends inwardly ;through the opening 6 so that its inner surface 7 will be fiush with the inner surface@ of the lining 4. The strainer shown is provided at its ;inner surface with bars 8 spaced to produce straner openings of less width than the diameter of the grindng elements employed in the mili. These strainer openi g are closed by a plug 9 which seats in the plug seat 7 to close or fill up same an fl s has, on it nne su face, p j ctions 10 adapted to fit into and register with the ,strainer openings of the strainer. These pr -ject ons l ar of a size and length sufficient to extend through such straincr openings and produce an' inner flat ,surface 10 fiush with the inner surface .of the strainer bars. The iner -surface's of such projections, straner and lining will athus be, entirely flush and no pockets, creviccs or indentations on the i nner lining wall of ;the cylinder will be formed in which small por'- tions of the material may lodge and remain ungronnd. V

As i stra ed, a g ding ip ll is provided at the outer side o-f the strainer and this guiding lip is forned integrally with the r ting 7 e Suitable means for handling the .plug .9 and for maintaining and securely looking the same .on its seat is provided and, as illustrated. said plug has connected thereto a. Od 0:1' arm :2 which is pivoted in axiallydispoeed k-nu l e 3 n the plug- .and is provid d at it p-p si e en with a thnmb scr w 1 Th rm is. ad pted o fit into a no h 15 n a hea g brac e 1:6 mouted the ext of the e d or head ef the oyl n r intermediat the e de of the arm 12, so that when the arm is seated in its said notch a screwng of the thumb screw 14: downwardly or inwardly in relation to the arm 12 will force the .outer end of the arm -upwardly and will, o wing to the fact that the said arm 12' ab-uts intermediate its ends on the hearing bracket 16 which forms a fulcrum therefo", cause the opposite pivoted end of the arm, which is attached to the plug, to` be forced inwardly so as to press the plug into its seat and lock the same therein.

Having described my invention, I `claim 1- l. In a grindi-ng mill, a drum having' a drain opening, a strainer provided with a plurality of strainer openings fitted within said drain opening and having its inner surface flush with the inner surface `of said dru-In, and a plug having aplurality of projections of a size and number corresponding to .and -regstering with the said strainer openings and of a length sufiicient to cause the :in-ner surface thereof to be flush with the -inner surface of the strainer.

2. In a grnding mill a drum conprising an outer shell and a lining of suitable material within said shell, said drum having a drain openingextending through said shell and lining, a strainer comprising a cupshaped member seated in said drain opening and extending from the outer shell through the linng and provided with a. depressed plug seat and strainer bars, the inner surface of which is flush with the surface of the lining, and a plug having a. body portion seated in the plug seat of the str s-imer and having projections of a size equal to the said strainer openings and of a length suicent to cau-se the inner surface thereo-f to be fiush with the inner surface of the strainer.

In witness whereof, I have signed my name to the foregoing specification in the presence of 'two subscribing witnesses.

JosErH F. GER-mir, HELEN V. VVHIDDEN. 

